Cirsium arvense [Creeping Thistle]

[Andrea B.]

Blum, A.G. 2013. Cirsium arvense (L.) Scopoli. (Asteraceae). Creeping Thistle. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...canada-thistle/

Found near Clark Point Road & Claremont Road, Southwest Harbor, Maine, USA

15 July 2012

Wildflower

 

Synonyms:

• Breea arvensis Less.
  
• Carduus arvensis (L.) Robson
  
• Cirsium arvense var. horridum Wimmer & Grab.
  
• Cirsium arvense var. integrifolium Wimmer & Grab.
  
• Cirsium arvense var. mite Wimmer & Grab.
  
• Serratula arvensis L.
  

Comment:

This thistle seems to be considered an invasive weed everywhere. Non-native to the US. The bees and some butterflies love it. The rays are quite UV-dark.

 

References:

1. Mittelhauser et al. (2010) Canada Thistle, page 86. The Plants of Acadia National Park. The U. of Maine Press, Orono, ME.

2. New England Wildflower Society (2013) Cirsium arvense (L.) Scop. Creeping Thistle. http://gobotany.newe...irsium/arvense/